skimage2.exposure.adjust_sigmoid#

skimage2.exposure.adjust_sigmoid(image, cutoff=0.5, gain=10, inv=False)[source]#

Performs Sigmoid Correction on the input image.

Also known as Contrast Adjustment. This function transforms the input image pixelwise according to the equation O = 1/(1 + exp*(gain*(cutoff - I))) after scaling each pixel to the range 0 to 1.

Parameters:

imagendarray: Input image.
cutofffloat, optional: Cutoff of the sigmoid function that shifts the characteristic curve in horizontal direction. Default value is 0.5.
gainfloat, optional: The constant multiplier in exponential’s power of sigmoid function. Default value is 10.
invbool, optional: If True, returns the negative sigmoid correction. Defaults to False.

Returns:

outndarray: Sigmoid corrected output image.